fuel-devops admin-setup no longer sets default gw for nodes because of centos7 anaconda changes

[Alex Schultz]

With the change to centos7 for the admin node, the dos.py admin-setup no longer sets the default gateway because the anaconda boot parameters have changed for centos7.

https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/Installation_Guide/chap-anaconda-boot-options.html

The network options like gateway now need to be part of the ip= settings.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/255420

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/255420
Committed: https://git.openstack.org/cgit/openstack/fuel-devops/commit/?id=6ae0b9875158f6b52325ec7709e3e7503c37acf6
Submitter: Jenkins
Branch: master

commit 6ae0b9875158f6b52325ec7709e3e7503c37acf6
Author: Alex Schultz <email address hidden>
Date: Wed Dec 9 11:21:48 2015 -0700

    Add admin-setup-centos7 and iface support

    The anaconda boot parameters have changed with centos7 so the networking
    information needs to be provided as part of the ip parameter. The gw,
    dns1, and netmask parameters are no longer supported. A new
    admin-setup-centos7 has been added to support the configuration of
    centos7 master nodes. Additionall the --iface option has been added for
    centos7 to support the use of predictable interface names and the old
    eth## style. The default for centos7 is predictable interface names.

    Change-Id: I91b7817bac2ef0c3c558b3b337c2661df829c7e6
    Closes-Bug: #1524440